COM Express is the most commonly used Computer on Module implementation. Although there are three different sizes and other technical variations, the Basic size (125 x 95mm) and Type 2 pin out configuration are the most widely used and will work for most applications.

The Type 2 COM Express pin out provides a number of high speed buses to the carrier board including PCI Express, PCI, VGA, SCDO, IDE, SATA, Ethernet, USB, LPC and more. These signals are used in Sealevel carrier board designs to create optimized, custom solutions that provide the application-specific I/O, connector layouts and mechanical configurations for target applications.